There are at least 10 suspected attackers, with four shot dead by police at the scene, Chinese state media report.

A female suspect was detained and is receiving treatment for injuries, reports say.

Eyewitnesses said the attackers used curved swords and meat cleavers to stab people at random.

A parking attendant at the scene, identified only by his surname, Chen, told Reuters news agency: "I saw five or six of them. They all had knives and they were stabbing people madly over by the first and second ticket offices."

Saturday's attack wounded at least 130, with terrified onlookers abandoning their luggage as they fled

China's authorities vowed to use "all out efforts" to find and punish the attackers

A vigil for the victims was held outside Kunming's main train station on Sunday

At the scene

By John SudworthBBC News, Kunming

The sense of national outrage and grief, being expressed in the outpouring on China's internet, is profound. On the station concourse, a small memorial has been set up where people are laying flowers and lighting candles.

Xiang Feng You, who has come to the station to see his wife safely onto her train, breaks down when I ask him what he thinks about what has happened here. "It's terrible," he says. And then choking back the tears: "I can't speak, I'm sorry."

There is anger too. "I feel so shocked," Tan Zhuzhu tells me after placing her candle on the ground. "How could they hurt innocent people? What if they were their friends and family then how would they feel?" she asks.

'Feelings of grief'

Kunming is the capital of China's Yunnan province. On Monday, security was tight, with a heavy police presence at Kunming station and surrounding areas.

Security checks at Kunming's Changshui International Airport were stepped up on Sunday, Xinhua said, while reports suggested there was also a greater police presence in China's capital, Beijing, on Monday.

A memorial for the victims has been set up at Kunming station's concourse.

More than 100 people attended a vigil at the station on Sunday night to mourn the victims, the South China Morning Post (SCMP) reported.

Kunming resident Chen Bing said: "I hate those terrorists. I want to in any way I can express my feelings of grief for those killed and injured."

Uighurs and Xinjiang

Uighurs are ethnically Turkic Muslims

They make up about 45% of the region's population; 40% are Han Chinese

China re-established control in 1949 after crushing short-lived state of East Turkestan

Another man at the vigil, who did not wish to be named, told the SCMP he was saddened by the incident but concerned over problems in Xinjiang.

He said: "We were never told why there was so much unrest there... what did our government do there to attract that much anger?"

Chinese authorities said evidence from the scene pointed to separatists from Xinjiang - a region in the far-west of China bordering Central Asia - as being behind the attack.

However, no details were given and the claim could not be verified.

Xinjiang is home to the Muslim Uighur minority group. Recent months have seen several violent incidents there which the government has blamed on extremists. Verifying these reports is difficult because foreign journalists' access to the region is tightly controlled.

China is often accused of exaggerating the threat of Islamist terrorism to justify its harsh security crackdown in Xinjiang and the restrictions it places on the religion and culture of the Uighurs.

Beijing is certain to argue that the scale and shocking brutality of this attack shows that the threat is real and serious, correspondents say.

The incident comes a few days before the opening of China's annual parliamentary session, the National People's Congress, where domestic security is expected to top the agenda.

Last October China blamed Xinjiang separatists when a car was driven into a crowd of people on the edge of Beijing's Tiananmen Square, leaving five dead.